Family name Райнис (Rajnis 
, Rainis 
, Райнис 
) , globally, is quite a rare cognomen. The family name Райнис is characteristic of Slovenia, where it is quite a rare surname, Czechia, and Latvia, where it is a rare surname. In absolute terms, the name is most common in Italy, the United States, and Czechia. Likewise, Райнис is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rajnis | Czechia, Germany, Slovenia, United States, India |
| Rainis | Czechia, Democratic Republic of the Congo, United States, India, Italy |
| Райнис | Kazakhstan, Russia, Kyrgyzstan |
| Raynis | Nicaragua, Canada, United States, Brazil, Venezuela |